I did a fresh install of Manjaro 5.4 and the internet was working fine. After I run the software update (some 433 packages were updated), I run the following commands to install Nvidia drivers for GeForce 920M (I got this command from another topic from this forum)
sudo mhwd -a pci nonfree 0300 sudo pacman -S downgrade (to downgrade network manager later)
The internet was working fine till then. I restarted the PC and the internet was gone. I tried downgrading network manager but to no avail. The outputs of some commands that were asked for in other topics have been provided below:
# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
# ip neighbour (no output whatsoever)
# ip route show (no output whatsoever)
# ping www.google.com
ping: www.google.com: Name or service not known
# ping 172.21.0.1 (my router ip)
ping: connect: Network is unreachable
I am now running this browser instance from the bootable drive and the internet is working fine evidently. The pings work fine and the output for 'ip link' is provided below
# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether 20:47:47:a9:d4:45 brd ff:ff:ff:ff:ff:ff
How to I restore internet connection?
Update : I did a fresh install of Manjaro and this time I omitted installing Nvidia drivers. I updated only the packages but still got the same result, so gpu drivers dont have any role in this situation.
Since you can't even ping the local router, it seems that your network interface is down. You need to setup your network with netctl.
netctl is profile based systemd network manager. ArchWiki has a good and clear document for configuration and usage of it: https://wiki.archlinux.org/index.php/Netctl
Don't forget to enable your profile after you finish your configuration.(# netctl enable PROFILE_NAME)